Yamaha F50A - Checking the Valve Springs; Checking the Valves

62Y3A11
5-40
1
2
3
4
5
6
7
8
I
5. Remove the retaining bolt
4
, then the
camshaft
5
by pulling it downward.
6. Remove the intake valve and exhaust
valves.
NOTE:
When replacing the valve, also replace the
valve guide and stem seal.
Checking the valve springs
1. Measure the valve spring free length
a
.
Replace if out of specification.
2. Measure the valve spring tilt
b
. Replace
if out of specification.
Checking the valves
1. Check the valve face for pitting or wear.
Replace if necessary.
Valve spring compressor
6
:
YM-01253 / 90890-04019
Valve spring compressor attachment
7
:
90890-06320
Valve spring free length limit
a
:
37.85 mm (1.490 in)
Valve spring tilt limit
b
: 1.7 mm (0.07 in)
Cylinder head